Registering Server DLL

Using Wise for Windows Installer, how do I include in my package the action to register a dll that is located on the server and not the client PC? So far, I've had to run my .msi package then using regsvr32, I've had to manually register the server dll's on the client. I know that I can just add these DLLs as files to include in the install package, but i do NOT want them to be run from or installed on to the client PC. I need them to stay on the server and run from there.

I want my .msi package to do this for me so I don't have to manually register those DLLs on the client.